Lansky QuadSharp Knife Sharpener; a compact multi angle pull through carbide sharpener. The QuadSharp features 17, 20, 25 and 30 degree carbide sharpening options, a tapered ceramic stone for polishing and serrated edges, a heavy duty metal housing and a lanyard hole. The Lansky QuadSharp has an overall length of 4 1/4".
From the Lansky website: Maintain your knives in the field to the exact angle you set with your Lansky Kit! Featuring the same four angles as the legendary Lansky Controlled-Angle System, for the perfect portable Sharpening accessory. The built-in ceramic polishing benchstone also allows the QuadSharp™ to be used as a fully functional, stand alone sharpening solution. The smallest, most versatile multi-angle sharpener available!